leon panetta suggested general john allen who said he will cooperate may be the last person involved. >> i am not aware of any others that could be involved in this issue at the present time. >> reporter: despite the probe, general petraeus who stepped down from the cia is scheduled to testify tomorrow on the deadly attacks in benghazi. republicans accuse united nations ambassador susan rice of misleading the public when she said protests, not terrorists, prompted that attack. >> there's a ream of evidence. >> she should have known what the situation and circumstances were. >> she has a lot of explaining to do. >> if senator mccain and senator graham and others want to go after somebody, they should go after me. but to smurch her reputation is outrage. >> reporter: the president said this will not deter him from nominating susan rice. john mccain says if that's the case, he will block it. tracie potts, nbc 11 news, washington. >>> back here at home a high-flying start-up is grounded. >> the eureka zeppelin will fly no more. the zeppelin, a common sight over the bay area. it had severa